configure default wallpaper

flake.nix

@@ -52,6 +52,12 @@
           pkgs = final;
           lib = inputs.nixpkgs.lib;
         };
+        niri-wallpaper = prev.runCommand "niri-wallpaper.png" {
+          buildInputs = [ prev.imagemagick ];
+        } ''
+          # solid white
+          convert -size 1920x1080 xc:white $out
+        '';
       };
 
       packages = eachSupportedSystem (

packages/niri/default.nix

@@ -8,7 +8,6 @@
   terminal ? lib.getExe pkgs.alacritty,
   runnerCommand ? "${lib.getExe pkgs.rofi} -show run",
   locker ? lib.getExe pkgs.swaylock,
-  wallpaperPath ? null,
   geolocation ? [
     52.5244
     13.4105
@@ -67,12 +66,12 @@ let
           spawn-at-startup = [
             (lib.getExe pkgs.ashell-kmein)
           ]
-          ++ lib.optional (wallpaperPath != null) [
+          ++ lib.optional (pkgs ? niri-wallpaper) [
             (lib.getExe pkgs.swaybg)
             "--mode"
             "fill"
             "--image"
-            wallpaperPath
+            (toString pkgs.niri-wallpaper)
           ]
           ++ lib.optional (geolocation != null) (
             let